An automobile ignition coil assembly and assembling method

Abstract

The application discloses a kind of automobile ignition coil assembly and assembly method, it is related to automobile accessory technical field, comprising: pin, with external low-voltage power supply connection;Spark plug, installation is in the inside of engine cylinder body;Further comprising: sealing assembly, installation is in the inside of engine cylinder body, with the spark plug is connected;Detection mechanism, with the sealing assembly cooperation, for detecting sealing assembly tightness;Mounting hole, with the sealing assembly connection, for sealing assembly installation;Sealing cover, installation is in the top of the detection mechanism;With detachable transformer modular structure: reverse unscrewing gland, support spring instantaneous energy release, will be transformer along guide groove whole pops out, complete tool replacement;The design can replace transformer alone under the premise of not needing to disassemble ignition coil assembly shell, avoid the damage of cylinder body sealing surface and oil gas leakage caused by repeatedly prying, simultaneously block external dust into combustion chamber, significantly reduce maintenance cost and prolong engine service life.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to an automotive ignition coil assembly and its assembly method. Background Technology

[0002] The automotive ignition coil assembly is a core component of the engine ignition system. Its function is to convert the vehicle's low-voltage power supply (usually 12V) into high-voltage electricity (20 kV to 30 kV) sufficient to break down the spark plug gap. Traditional ignition coil assemblies generally adopt a one-time encapsulation structure: the coil body, iron core, and high-voltage lead terminals are integrally encapsulated in a metal or plastic shell with epoxy resin or thermosetting plastic, and then fixed to the mounting hole on the engine cylinder head by screws or clips to achieve high-voltage connection with the spark plug.

[0003] While this monolithic potting structure has the advantages of small size and good vibration resistance, it also brings the following insurmountable drawbacks:

[0004] The coil body and housing are completely solidified together. Once the coil winding burns out due to overheating, interlayer breakdown, or overload, the entire ignition coil assembly must be scrapped and replaced; the internal transformer module cannot be replaced separately. This not only wastes resources but also increases the operating costs for car owners.

[0005] When replacing the ignition coil, the entire ignition coil assembly must first be removed from the engine. During the disassembly process, the connection with the high-voltage terminal of the spark plug needs to be loosened. Repeated insertion and removal can easily cause wear on the high-voltage terminal and damage to the cylinder block threads. At the same time, since the assembly housing and the engine mounting hole are usually sealed with an "O" ring or a flat gasket, repeated disassembly and assembly will damage the flatness and roughness of the sealing surface, leading to seal failure and oil and gas leakage. In severe cases, it can cause engine vibration, increased fuel consumption, or even damage to the three-way catalytic converter.

[0006] Therefore, this solution provides an ignition coil assembly that allows for individual replacement of the internal transformer and enables quick assembly and disassembly without compromising sealing performance. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides an automotive ignition coil assembly and assembly method, which solves the problems mentioned in the background art, such as high replacement costs of existing ignition coil assemblies and the tendency for the sealing surface to deteriorate.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an automotive ignition coil assembly and assembly method, comprising:

[0009] Pins are used to connect to an external low-voltage power supply.

[0010] Spark plugs are installed inside the engine block;

[0011] Also includes:

[0012] A sealing assembly, installed inside the engine block, is connected to the spark plug;

[0013] The testing mechanism, in conjunction with the sealing assembly, is used to test the sealing performance of the sealing assembly;

[0014] Mounting holes are used to connect with the sealing assembly for mounting the sealing assembly;

[0015] A sealing cap is installed on top of the detection mechanism;

[0016] A connecting component, one end of which is connected to the detection mechanism and the other end of which is connected to the sealing component;

[0017] A transformer, installed inside the connection assembly, is used to convert low-voltage current into high-voltage current;

[0018] The suppression resistor is located inside the connection assembly and is electrically connected to the transformer and the spark plug, respectively.

[0019] Preferably, the transformer includes a coil housing, inside which a coil body is disposed. A base is installed at the bottom of the coil housing, and an electrode needle is embedded at the bottom of the base. The electrode needle has two electrodes, one corresponding to the positive and one to the negative current, and is electrically connected to a current-carrying block through the coil body. The current-carrying block is embedded at the bottom of the base, and one end of the bottom of the current-carrying block protrudes from the surface of the base. The transformer adopts an integrated coil housing and base structure, with the electrode needle and current-carrying block embedded in the base and protruding outwards, allowing the entire transformer to be quickly inserted and removed from the top of the assembly without tools. When the coil body burns out, repairs can be completed simply by removing the old transformer and inserting the new part, without removing the entire ignition coil or damaging the sealing surface of the housing. This avoids the waste of resources and increased costs caused by the traditional integrated potting structure, which requires scrapping the entire component, and completely eliminates the risk of damage to the sealing surface and oil and gas leakage caused by repeated disassembly and assembly.

[0020] Preferably, the connecting assembly includes a housing with two limiting grooves on its inner wall. Copper sheets are embedded in the limiting grooves, each with two corresponding positive and negative terminals. The copper sheets are connected to pins via wires embedded within the housing. The copper sheets slide in contact with ball bearings, which are embedded in the outer wall of the connecting block. A mating groove is provided on the top surface of the connecting block, electrically connected to the ball bearings. The surface of the mating groove is in close contact with the electrode pins. A circular through-hole is provided inside the connecting block, and a support spring is provided at the bottom of the connecting block. By embedding positive and negative copper sheets within the housing and allowing them to slide elastically in contact with the ball bearings, the connecting block maintains a tight fit between the mating groove and the transformer electrode pins under the action of the support spring. This ensures reliable transmission of low-voltage current and automatically compensates for wear gaps during transformer replacement using the elastic displacement of the ball-copper sheet sliding pair, preventing poor contact.

[0021] Preferably, the copper sheet is curved and elastically contacts the surface of the ball, while the ball slides in contact with the inner wall of the limiting groove. A guide groove is provided on the inner wall of the housing, which is vertically arranged and slides in contact with the limiting block. The limiting block is fixedly connected to the base. The elastic sliding contact between the curved copper sheet and the ball provides a continuous and stable contact pressure for current transmission. The ball can roll freely in the limiting groove and automatically compensate for wear. The vertical sliding cooperation between the guide groove and the limiting block ensures that the transformer always moves along a fixed trajectory when plugged in and out. This ensures accurate alignment of the positive and negative electrode pins with the docking groove, prevents contact misalignment, and enables tool-free quick assembly and disassembly, avoiding housing deformation and sealing failure caused by repeated plugging and unplugging in traditional structures.

[0022] Preferably, the sealing assembly includes an expansion block, one bottom end of which is fitted onto the outside of the spark plug. A sealing ring is embedded in the outside of the expansion block, and multiple sealing rings are evenly spaced from top to bottom. A first high-pressure spring is disposed inside the expansion block. The bottom end of the first high-pressure spring is tightly fitted to the spark plug, and the top end of the first high-pressure spring is fixedly connected to an insulating metal sheet. The top end of the insulating metal sheet is fixedly connected to the bottom end of a second high-pressure spring, and the top end of the second high-pressure spring contacts the output terminal of a suppression resistor. The input terminal of the suppression resistor contacts a energized block. The expansion block utilizes multiple sealing rings to form a multi-stage interference seal with the engine mounting hole wall. When the housing is pressed down, the outer wall of the expansion block is simultaneously expanded, causing all sealing rings to fit evenly and continuously compensate for wear under the action of the first high-pressure spring. The insulating metal sheet and the second high-pressure spring stably transmit the high-pressure pulse to the spark plug via the suppression resistor. This ensures zero leakage under high temperature and high pressure conditions and prevents ignition energy attenuation, achieving the maintenance of cylinder sealing surface integrity and stable ignition performance without disassembling the housing.

[0023] Preferably, the isolation metal sheet is embedded inside the bottom end of the housing, and the contact surface between the isolation metal sheet and the housing is made of rubber. An annular groove is provided at the bottom end of the housing, and the bottom end of the housing is engaged with the annular groove on the inner wall of the expansion block through the annular groove. After the rubber interface between the isolation metal sheet and the housing is engaged, a radial and axial double elastic seal is formed, preventing high-temperature oil and gas from leaking out along the metal gap.

[0024] Preferably, the detection mechanism includes a rubber block embedded in the inner wall of the connecting cover. The connecting cover is fixedly connected to one end of the top of the housing. The rubber block has internal slots that extend through the top and bottom of the rubber block. The connecting cover slides in contact with the outer wall of the indicator block. The bottom of the indicator block has an annular protrusion and a hollow interior, with the bottom of the indicator block being open. A rubber cap is fixedly installed on the bottom edge of the connecting cover. The outer wall of the rubber cap is corrugated, and fins are embedded in the outer wall of the connecting cover. The top of the connecting cover is threadedly connected to the gland. The detection mechanism utilizes the self-closing slots of the rubber block to slide in conjunction with the indicator block. During assembly, excess air in the cylinder is automatically discharged and kept in a normally closed state. Once a micro-leak occurs in the sealing component, the leaking oil and gas instantly pushes up the indicator block, forming a visible bulge, achieving real-time warning without disassembly. The corrugated rubber cap and fins work together to dissipate heat, preventing high-temperature aging and maintaining the elastic fit between the connecting cover and the cylinder head surface, ensuring long-term zero leakage and extending the overall service life.

[0025] Preferably, step one: tighten the spark plug into the threaded hole in the engine cylinder head, ensuring that the spark plug gasket is in contact with the cylinder head plane;

[0026] Step 2: Slide the expansion block along with the multi-stage sealing rings onto the outer ceramic body of the spark plug from top to bottom until the bottom limiting shoulder of the expansion block fits against the hexagonal head of the spark plug. Check that each sealing ring is not twisted or damaged.

[0027] Step 3: Press the housing of the connecting component vertically down so that its bottom annular groove enters the groove on the inner wall of the expansion block; continue to press down, the outer wall of the expansion block is opened, and the sealing ring forms an interference seal with the engine mounting hole wall;

[0028] Step 4: Keeping the housing still, insert the transformer vertically along the guide groove until the base limiting block contacts the bottom of the guide groove; at this time, the electrode needle automatically and elastically fits into the connecting block groove.

[0029] Step 5: Screw the pressure cap into the top of the connection cover to fully compress the transformer; plug the external wiring harness plug into the assembly pins.

[0030] This invention provides an automotive ignition coil assembly and its assembly method. It offers the following advantages:

[0031] The transformer adopts a modular structure with a detachable design: the circumferential limiting block of the coil housing and the guide groove of the housing are linearly matched to achieve one-time axial insertion of the transformer into the slot at the top of the connecting cover; during the tightening of the cover, the support spring is compressed in a controlled manner and continuously outputs elastic force through the docking groove of the connecting block, ensuring that the electrode needle and the docking groove maintain low-resistance contact under thermal expansion and contraction and vibration conditions; after the cover is loosened in the reverse direction, the support spring releases energy instantaneously, popping the transformer out along the guide groove as a whole, completing the tool-less replacement; this design allows the transformer to be replaced separately without disassembling the ignition coil assembly housing, avoiding damage to the cylinder block sealing surface and oil and gas leakage caused by repeated prying, while blocking external dust from entering the combustion chamber, significantly reducing maintenance costs and extending engine life. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the indicator block structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0035] Figure 4 This is a schematic diagram of the transformer structure of the present invention;

[0036] Figure 5 This is a schematic diagram of the limiting block structure of the present invention;

[0037] Figure 6 This is a schematic diagram of the copper sheet structure of the present invention;

[0038] Figure 7 This is a schematic diagram of the fin structure of the present invention;

[0039] Figure 8 This is a schematic diagram of the expansion block structure of the present invention.

[0040] In the diagram, 1. Pin; 2. Spark plug; 3. Sealing assembly; 301. Expansion block; 302. Sealing ring; 303. First high-pressure spring; 304. Isolating metal sheet; 305. Second high-pressure spring; 4. Detection mechanism; 401. Rubber block; 402. Indicator block; 403. Connecting cover; 404. Rubber cover; 405. Pressure cover; 406. Fin; 5. Mounting hole; 6. Sealing cover; 7. Connecting assembly; 701. Housing; 702. Limiting groove; 703. Copper sheet; 704. Ball bearing; 705. Connecting block; 706. Support spring; 707. Connecting groove; 708. Guide groove; 8. Transformer; 801. Coil housing; 802. Coil body; 803. Base; 804. Electrode pin; 805. Limiting block; 806. Energizing block; 9. Suppression resistor. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1: Please refer to Figure 1-8 This invention provides a technical solution: an automotive ignition coil assembly, comprising: pin 1, connected to an external low-voltage power supply; spark plug 2, installed inside the engine block; further comprising: a sealing assembly 3, installed inside the engine block and connected to the spark plug 2; a detection mechanism 4, cooperating with the sealing assembly 3 for detecting the sealing performance of the sealing assembly 3; a mounting hole 5, connected to the sealing assembly 3 for installing the sealing assembly 3; a sealing cap 6, installed on the top of the detection mechanism 4; a connecting assembly 7, one end of which is connected to the detection mechanism 4 and the other end of which is connected to the sealing assembly 3; a transformer 8, installed inside the connecting assembly 7 for converting low-voltage current into high-voltage current; and a suppression resistor 9, located inside the connecting assembly 7 and electrically connected to the transformer 8 and the spark plug 2 respectively.

[0043] This invention, through its embodiment, designs the transformer 8 as a replaceable module that can be installed or ejected entirely from the top of the assembly. This eliminates the need to remove the entire ignition coil during installation or maintenance, avoiding repeated prying of the assembly and engine block sealing surfaces. This completely solves the problems of traditional integral potting structures where the entire component must be scrapped if the coil burns out, and where oil and gas leaks occur due to damage to the sealing surface during maintenance. Simultaneously, a detection mechanism 4, linked to the sealing component 3, is integrated at the top of the assembly. When an early micro-leak occurs in the sealing ring 302, the indicator block 402 of the detection mechanism 4 is immediately lifted by the leaking gas pressure, achieving real-time sealing monitoring without disassembly. This overcomes the shortcomings of traditional structures that cannot provide early warning of sealing failure and can only be passively discovered after misfire or ECU code reporting.

[0044] Example 2: Please refer to Figure 1-8This invention provides a technical solution: an automotive ignition coil assembly. A transformer 8 includes a coil housing 801, a coil body 802 inside the housing 801, a base 803 at the bottom of the housing 801, and an electrode needle 804 embedded in the bottom of the base 803. The electrode needle 804 has two electrodes corresponding to the positive and negative terminals of the current, and is electrically connected to a current-carrying block 806 via the coil body 802. The current-carrying block 806 is embedded in the bottom of the base 803, with one end of its bottom protruding from the surface of the base 803. A connecting component 7 includes a housing 701, with two limiting grooves 702 formed in the inner wall of the housing 701. A copper sheet 703 is embedded inside the limiting grooves 702, with two electrodes corresponding to the positive and negative terminals of the current, and is connected to a current-carrying wire. The wire is embedded inside the housing 701 and connected to pin 1. The surface of the copper sheet 703 slides in contact with the ball 704. The ball 704 is embedded in the outer wall of the connecting block 705. The top surface of the connecting block 705 is provided with a mating groove 707, which is electrically connected to the ball 704. The surface of the mating groove 707 is in close contact with the electrode needle 804. A circular through hole is opened inside the connecting block 705. A support spring 706 is provided at the bottom of the connecting block 705. The copper sheet 703 is curved and elastically contacts the surface of the ball 704. The ball 704 slides in contact with the inner wall of the limiting groove 702. A guide groove 708 is opened on the inner wall of the housing 701. The guide groove 708 is vertically arranged and slides in contact with the limiting block 805. The limiting block 805 is fixedly connected to the base 803.

[0045] In this embodiment of the invention, the transformer 8 of the ignition coil assembly is designed to be detachable. During installation, the limiting block 805 of the coil housing 801 is aligned with the guide groove 708, allowing the transformer 8 to be installed into the housing 701 through the hole in the top of the connecting cover 403. Tightening the cover 405 allows the transformer 8 to move downwards, compressing the support spring 706. Under the action of the support spring 706, the mating groove 707 on the top surface of the connecting block 705 is pushed, ensuring constant contact between the electrode pins 804 of the transformer 8. This guarantees that the electrode pins 804 of the transformer 8 maintain stable contact with the mating groove 707. Furthermore, external low voltage is applied through the pin 1, and current is transmitted through the pin 1 to the copper sheet 703 and the ball bearing 704, thereby causing the ball bearing 704 to... Electrode needle 804 can be energized, thereby achieving the effect of energizing the external low voltage and transformer 8. When the internal coil of transformer 8 in this ignition coil assembly is damaged and needs to be replaced, the cover 405 is removed by rotation, and the support spring 706 will release its elasticity, allowing transformer 8 to pop out from the hole slot at the top of the connecting cover 403, thus enabling quick replacement. By making transformer 8 detachable, when the internal coil body 802 is damaged, only the internal transformer 8 needs to be replaced, without replacing the entire ignition coil assembly. By avoiding the disassembly of the ignition coil assembly housing, it is beneficial to maintain the sealing of the contact surface between the ignition coil assembly housing and the engine block. In addition, it is beneficial to prevent external dust from entering the engine block when replacing the ignition coil assembly.

[0046] Example 3: Please refer to Figure 1-8This invention provides a technical solution: an automotive ignition coil assembly, wherein the sealing component 3 includes an expansion block 301, one bottom end of which is fitted onto the outside of a spark plug 2, and a sealing ring 302 is embedded on the outside of the expansion block 301. Multiple sealing rings 302 are distributed at equal intervals from top to bottom. A first high-voltage spring 303 is disposed inside the expansion block 301, one bottom end of which is tightly fitted to the spark plug 2, and one top end of which is fixedly connected to an insulating metal sheet 304. One top end of the insulating metal sheet 304 is fixedly connected to one bottom end of a second high-voltage spring 305, and one top end of the second high-voltage spring 305 is in contact with the output terminal of a suppression resistor 9. The input terminal of the suppression resistor 9 is in contact with a energizing block 806. The insulating metal sheet 304 is embedded inside one bottom end of a housing 701, and the contact surface between the insulating metal sheet 304 and the housing 701 is made of rubber. The housing 701 has an annular groove at one bottom end, which engages with the annular groove on the inner wall of the expansion block 301. The detection mechanism 4 includes a rubber block 401, which is embedded in the inner wall of the connecting cover 403. The connecting cover 403 is fixedly connected to the top end of the housing 701. The rubber block 401 has a hole groove inside, which extends through the top and bottom of the rubber block 401. The inside of the connecting cover 403 slides in contact with the outer wall of the indicator block 402. The bottom of the indicator block 402 has an annular protruding structure, and the inside of the indicator block 402 is hollow and open. A rubber cover 404 is fixedly installed on the bottom edge of the connecting cover 403. The outer wall of the rubber cover 404 is corrugated, and fins 406 are embedded in the outer wall of the connecting cover 403. The top of the connecting cover 403 is threadedly connected to the pressure cover 405.

[0047] In this embodiment, after the spark plug 2 is installed into the engine block using external tools, the housing 701 and the expansion block 301 are inserted into the ignition coil assembly mounting hole 5 groove on the surface of the engine block. Once one end of the expansion block 301 is fitted over the spark plug 2, the housing 701 continues to be inserted downwards, causing one end of the housing 701 to penetrate into the expansion block 301. This allows the outer wall of the expansion block 301 to expand outwards, enabling the sealing ring 302 to fit against the inner wall of the mounting hole 5 groove on the surface of the engine block. This helps prevent the leakage of high-temperature oil and gas from inside the engine block. Simultaneously with the insertion of the housing 701, the rubber cap 404 at the bottom of the connecting cover 403 will... The indicator block 402 fits tightly against the outer wall of the engine cylinder block. Excess air inside the engine mounting hole 5 will push the indicator block 402 out. After the mounting hole 5 is connected to the engine with bolts, pressing the indicator block 402 will cause the excess air inside the engine mounting hole 5 to be discharged from the groove inside the rubber block 401, allowing the indicator block 402 to return to its original position. The groove inside the rubber block 401 is closed under the pressure of the rubber block 401 itself. When there is oil or gas leakage at the contact surface between the sealing ring 302 and the engine cylinder block, the air pressure will push the indicator block 402 up, which can indicate that the internal sealing ring 302 is leaking, so that it can be replaced in time.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automotive ignition coil assembly, comprising: Pin (1) is connected to an external low-voltage power supply; Spark plug (2), installed inside the engine block; Its characteristic is that it further includes: A sealing assembly (3) is connected to the spark plug (2); The testing mechanism (4) cooperates with the sealing assembly (3) to test the sealing performance of the sealing assembly (3); Mounting hole (5) is connected to the sealing assembly (3) for mounting the sealing assembly (3); A sealing cap (6) is installed on top of the detection mechanism (4); The connecting component (7) has its top end connected to the detection mechanism (4) and its bottom end connected to the sealing component (3); A transformer (8) is installed inside the connection assembly (7) for converting low-voltage current into high-voltage current; The suppression resistor (9) is located inside the connection assembly (7) and is electrically connected to the transformer (8) and the spark plug (2) respectively; The connecting assembly (7) includes a housing (701), the inner wall of which has two limiting grooves (702), and a copper sheet (703) is embedded in the limiting groove (702). The copper sheet (703) has two corresponding positive and negative poles, and the copper sheet (703) is connected to the pin (1) through a wire. The wire is embedded in the housing (701). The surface of the copper sheet (703) slides in contact with the ball (704). The ball (704) is embedded in the outer wall of the connecting block (705). The top surface of the connecting block (705) is provided with a mating groove (707). The mating groove (707) is electrically connected to the ball (704). The surface of the mating groove (707) is tightly fitted with the electrode pin (804). A circular through hole is opened inside the connecting block (705). A support spring (706) is provided at the bottom of the connecting block (705). The sealing assembly (3) includes an expansion block (301), one end of which is fitted onto the outside of the spark plug (2). A sealing ring (302) is embedded in the outside of the expansion block (301). Multiple sealing rings (302) are distributed at equal intervals from top to bottom. A first high-pressure spring (303) is provided inside the expansion block (301). One end of the first high-pressure spring (303) is tightly fitted to the spark plug (2), and one end of the first high-pressure spring (303) is fixedly connected to an isolation metal sheet (304). One end of the isolation metal sheet (304) is fixedly connected to one end of the bottom of a second high-pressure spring (305). One end of the second high-pressure spring (305) is in contact with the output end of the suppression resistor (9). The input end of the suppression resistor (9) is in contact with the energizing block (806). The detection mechanism (4) includes a rubber block (401), which is embedded in the inner wall of the connecting cover (403). The connecting cover (403) is fixedly connected to the top end of the housing (701). The rubber block (401) has a groove inside, and the groove inside the rubber block (401) penetrates the top and bottom of the rubber block (401). The inside of the connecting cover (403) slides in contact with the outer wall of the indicator block (402). The bottom of the indicator block (402) has an annular protruding structure, and the inside of the indicator block (402) is hollow. The bottom of the indicator block (402) is open. A rubber cover (404) is fixedly installed on the bottom edge of the connecting cover (403). The outer wall of the rubber cover (404) is corrugated, and fins (406) are embedded in the outer wall of the connecting cover (403). The top of the connecting cover (403) is threadedly connected to the pressure cap (405).

2. The automotive ignition coil assembly according to claim 1, characterized in that: The transformer (8) includes a coil housing (801), a coil body (802) is provided inside the coil housing (801), a base (803) is installed at the bottom of the coil housing (801), an electrode needle (804) is embedded at the bottom of the base (803), the electrode needle (804) has two corresponding positive and negative poles, and the electrode needle (804) is electrically connected to the energizing block (806) through the coil body (802). The energizing block (806) is embedded at the bottom of the base (803), and one end of the bottom of the energizing block (806) protrudes from the surface of the base (803).

3. The automotive ignition coil assembly according to claim 2, characterized in that: The copper sheet (703) is curved and elastically contacts the surface of the ball (704), while the ball (704) slides in contact with the inner wall of the limiting groove (702). The inner wall of the housing (701) is provided with a guide groove (708), which is vertically arranged and slides in contact with the limiting block (805). The limiting block (805) is fixedly connected to the base (803).

4. The automotive ignition coil assembly according to claim 3, characterized in that: The isolation metal sheet (304) is embedded inside the bottom end of the housing (701), and the contact surface between the isolation metal sheet (304) and the housing (701) is made of rubber. The bottom end of the housing (701) is provided with an annular groove, and the bottom end of the housing (701) is engaged with the annular groove on the inner wall of the expansion block (301) through the annular groove.

5. The assembly method of an automotive ignition coil assembly according to claim 4, characterized in that: Step 1: Tighten the spark plug (2) into the threaded hole of the engine cylinder head, ensuring that the spark plug (2) gasket is in contact with the cylinder head plane; Step 2: Insert the expansion block (301) together with the multi-level sealing ring (302) into the outer ceramic body of the spark plug (2) from top to bottom until the bottom limiting shoulder of the expansion block (301) fits against the hexagonal head of the spark plug (2). Check that each sealing ring (302) is not twisted or damaged. Step 3: Press the housing (701) of the connecting component (7) vertically downwards so that its bottom annular groove enters the groove on the inner wall of the expansion block (301); continue to press down, the outer wall of the expansion block (301) is opened, and the sealing ring (302) forms an interference seal with the wall of the engine mounting hole (5); Step 4: Keep the housing (701) still and insert the transformer (8) vertically along the guide groove (708) until the base (803) limit block (805) contacts the bottom end of the guide groove (708); at this time, the electrode needle (804) automatically and elastically fits into the docking groove (707) of the connecting block (705); Step 5: Screw the pressure cap (405) into the top of the connecting cover (403) while fully pressing the transformer (8); plug the external wiring harness plug into the assembly pin (1).

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